Expansion-cover for bolts



(No Moae1.)- I

. NQH. vSTEWARD.

EXPANSION COVER FOB BOLTS.

No. 508,254, l Patented Nov. 7, 1893. Y

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l' l UNITED i STATES PATENT OFFICE.

NATHAN HARPER sTEwARD, oF PHILADELPHIA, PENNSYLVANIA, AssIGNoR To THE sTEwARD a ROMAINE MANUFACTURING COMPANY, LIMITED,

OF SAME PLACE.

EXPANSION-COVER FOR BOLTS.

SPECIFICATION ,forming part of Letters Patent No. 508,254, dated November 7, 1893.

Application filed February 16,1 893.

Tc all whom it may concern;

Be it known that I, NATHAN HARPER STEW-` ARD, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania,- have invented a new and useful Improvement in Expansion- Covers for Bolts, of which the following is a description sufficiently clear and eXact as will enable others skilled in the art to which [o my invention appertains to make and'use the same, reference being had t0 the drawings herewith.

This invention has reference tov improvements in expansion covers for bolts, the well' understood purposes of which are to secure stands, brackets, 85o., to masonry, iron, or other surfaces, and for other purposes too numerous to describe, and the Vinvention is hereinafter described. Y

By referring to the drawings herewith, it is intended to show a cheap, practical and thoroughly reliable construction as will cover all of the weak points of any make now in use.

The principal object sought to be co vered 2 5 by my improvement is the immediate action of the expansion covering upon the inner walls of the chamber or cavity where any power is v applied to the bolt when the intention is to fasten it in position. v

Referring to the drawings herewith, Figure 1,-is a side elevation of the covering shown applied to a bolt of common form. Fig. 2, is

a vertical section on linev cc-x of Fig. 3. Fig.

3, is also a side view taken from a right an- 3 5 gle point to the Fig. l view. Fig. 4, is avertical section on line y-n-y of Fig. l. Figs. 5,' 6, 7, 8, are cross-sections respectively on lines l, 2, 3, 4:.' Fig. 9, is a side view of the circu-` lar sleeve and conical following washer. Fig.

4o 10, is a side view of the circular and conical nut.

Similar letters have reference to like parts.

@,Vrepresents 'a screw threaded bolt of suitable shape to be used with an expansion covering.

c, l1s a nut also screw threaded and shown in the drawings as occupying a position at the extreme bottom part of the bolt c.

d, is a circular sleeve or washer of peculiar Serial No. 462,621. (No model.)

i construction held in position under the head of the bolt and connected to the partially conical circular nut c, by means of the sectional circular covering h.

The screw threaded nut c is constructed tapering at the end facing the sliding sleeve d, and at or near the small end of the tapering part of the screw threaded nut c, is provided with two small (and preferably square) lugs or Vteat-like projections c', .in directly opposite positions ou or near the extreme edge of the tapering portion of the nut. In a directly transverse line on the tapering face of the said nut c, are two V shaped ribs c2, c2. Theouter faces of thethese ribs are of the same size and contour as the main body of the nut,

c. The circular sleeve or washer CZ, alsotapering upon .two opposite faces of the conical end, or the part facing the nut when all of the parts are in position on the bolt, is also provided with lugs or teat-like projections d', similar in all respects to those on the nut c, and the sleeve or washeris also provided with V shaped ribs d2 d2 forming an integral part of the body ofthe sleeve, d, and having a similar contour to the outside circle of the latter.

The sectional shell covering interposed between the screw-threaded nut c, and the sleeve d both constructed substantially as described, is composed preferably of two parts b and bo, both of which are exactly similar in shape having tapering ends h3, at a similar angle toy make them snugly fit the angle of the ribs cl2, and c2, of thesleeve d and nut c.

VVithiu thetapering portion orv near each end of each :section b and b of the circular shell covering are small openings b', preferably square, to correspond to the shape of the lugs or teat-like projections d and c on the sleeve and nut' respectively. Inclined channels ?92 lead from these openings to the inner walls of each of the parts of the sectional shell covering, and the metal under the taposition. Suitable wire or rubber fastenings are used to assemble the bolt for transportation and use.

In the operation of my improved expansion covering, the assembled covering after being placed in the cavity or hole prepared to receive it, causes the outer face ofthe sleeve to shoulder against the bracket bar to be secured with the kind of a part to be supported in a manner mechanically understood. After having introduced the bolt suciently far enough to slightly tighten it, any further revolution of it by force causes the bolt to advance inwardly. The nut being so constructed and placed in the close fitting cavity is slightly forced in the opposite direction to the movement of the bolt, and the connections between the sleeve sliding loosely on the main. body of the bolt by means of the connections between it and the nut, will cause the sectional covering to expand alike at all `points on its surface, and thereby impinge and bind firmly against the inner walls of the cavity. It Will readily be seen that as the bolt is being forced up to its full holding position the sliding conical sleeve butting against the bracket or part to be fastened, limits all out- I am aware that bolts have been provided with single and double wedge shaped nuts and sectional expansible side covers, and I do not therefore broadly lay claim to such; but

What I do claim, and desire to secure by Letters Patent, is-` The combination of the sectional shell eX- pansion covering b having inclined tapering ends and provided with apertures b and inclined channels b2, the screw-threaded partially tapering nut c it being provided with diametric ribs and lugs on its inclined end, with similarly constructed sliding washer or sleeve d, with the screw bolt a, when constructed as described and arranged to operate in the manner-and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

N. HARPER STE WARD.

Witnesses:

LEWIS F. BRoUs, JOHN BRoUs. 

